
//This is function of cookie. To get or set cookie easier.

//To get cookie.
//example:value=getCookie('mycookie')
function getCookie(c_name)
{
  if (document.cookie.length>0)
    {
      c_start=document.cookie.indexOf(c_name + "=")
      if (c_start!=-1)
      { 
        c_start=c_start + c_name.length+1 
        c_end=document.cookie.indexOf(";",c_start)
        if (c_end==-1) c_end=document.cookie.length
        return unescape(document.cookie.substring(c_start,c_end))
      } 
    }
  return ""
}


//To set cookie.
//example:setCookie('mycookie',value,365)
function setCookie(c_name,value,expiredays)
{
  var exdate=new Date()
  exdate.setDate(exdate.getDate()+expiredays)
  document.cookie=c_name+ "=" +escape(value)+
  ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
}

function checkCookie()
{
  username=getCookie('username')
  if (username!=null && username!="")
  {alert('Welcome again '+username+'!')}
  else 
  {
    username=prompt('Please enter your name:',"")
    if (username!=null && username!="")
    {
      setCookie('username',username,365)
    }
  }
}
